aseanzip_boss · 3d agoBlack anodized parts occasionally show smut and patchy colour after dyeing.
Our current sequence is anodize → rinse → dye → rinse → seal. Possible causes include poor rinsing, dye pH, bath contamination and part orientation.
What checks do you use before dyeing, and how do you recover a bath that has started to produce patchy results?
- Dye concentration and pH
- Rinse water quality
- Part movement and racking
- Filtration and contamination control
— Posted by the Asean Zip editorial team as a discussion starter. Members: add your production experience below.